Big Block Chevy Engine Parts Identification Engine Blocks Cylinder Heads BBC Cams Crankshafts Pistons Intake Manifolds Exhaust Manifolds Balancer/Flywheel Info BBC Engine Block Casting Numbers Casting # Year CID HP/RPO/Comments/Applications 340220 1972-76 427 tall truck 345014 1974-86 454 truck 346236 1974-76 454 215, 2 bolt 359070 1974-90 454 truck 361959 1973-85 454 car & truck 364776 1968-84 427 tall truck 364779 1968-88 366 tall truck 473478 1968-84 427 tall truck 3782870 1968-76 427 tall truck 3855061 1965-67 396 3855961 1966-67 396 325, 360, 2 bolt 3855962 1965-66 396 360, 375, 425, 4 bolt 3855977 1965-67 366 tall truck 3866961 1966-69 396 Chevy, Chevy truck 3869942 1966-67 427 390, 425, 2&4 bolt 3873858 1966 396 375, 4 bolt 3902406 1967 396 325, 350, 375, 2&4 bolt 3902466 1965-67 396 3904351 1967 427 385, 390, 400, 425, 430, 435, 2&4 bolt 3904354 1966-67 366 tall truck 3916319 1968-85 366 tall truck 3916321 1968 427 385, 390, 400, 425, 430, 435, 2&4 bolt 3916323 1968 396 325, 350, 375, 2&4 bolt 3918319 1966-70 366 Chevy truck, GMC, tall truck 3925521 1968-85 366 tall truck 3928319 1969-73 366 GMC, tall truck
3935439 1968-69 427 335, 390, 400, 425, 430, 435, 2&4 bolt 3935440 1968-69 396 265, 325, 350, 375, 2&4 bolt 3937724 1968-85 366 tall truck 3937726 1968-84 427 tall truck 3955270 1969 427 335, 390, 400, 425, 430, 435, 2&4 bolt 3946052 1969 427 430 ZL-1, 4 bolt, aluminum 3955272 1969 396/402 265, 325, 350, 375, 2&4 bolt 3955274 1968-85 366 tall truck 3955276 1968-84 427 tall truck 3963512 1969-71 427 335, 390, 400, 425 COPO, 430, 435, 454 345, 360, 365, 390, 425, 450 2&4 bolt 3963513 1973-76 454 215 3965440 1968-69 396 3965449 1968-72 396 3965540 1968 396 3969854 1969-72 396/402 240, 265, 300, 325, 330, 350, 375, 454 360, 2&4 bolt 3969858 1968-84 427 tall truck 3999289 1972-78 454 215, 235, 240, 270, 2 bolt, car & truck 3999290 1972 402 240, 2 bolt 3999293 1968-85 366 tall truck 3999294 1968-84 427 tall truck 6272176 1968-76 366 Chevy, GMC, tall truck 6272177 1972 402 210 6272181 1973-76 427 tall truck 1401544 1975-87 454 truck Big Block Chevy Cylinder Heads Open vs. Closed Chamber - A good way to describe big-block heads is to categorize them as open or closed chamber. Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. Openchamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head.
Use of either style head requires that the correct pistons are used, otherwise... BBC Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust Casting Years CID Chamber CC HP/RPO/Comments 3904392 1967 427 Closed 106.8 430, 435 L-88/L-89, 1.72 ex 3919842 1968-69 396 375 L-89 427 Closed 106.8 430, 435 L-88/L-89, 1.84 ex 3946074 1969-71 396,402 375 L-89, 427 430 L-88/ZL-1 454 Open 118.0 425, 465 LS-6/LS-7, round ex 10051128 1990-94 454 Semi Open 72cc, IP 400cc, bowtie, sym port 14011077 1989-94 454 Open 118.0cc, IP 295cc, replacement, C port 14044861 1989-94 454 Open 425, 105.0cc, IP 380cc, bowtie, W port 3856208 1965 396 Closed 108.9 375, 425 Z-16/L-37, 1.72 ex 3873858 1966-67 396 375 L-78 427 Closed 108.9 425 L-72, 1.72 ex 3904391 1965-67 396 375 L-78 427 Closed 106.8 425, 435 L-71/L-72, 1.72 ex 3919840 1967-69 396 375 L-78, 1.72.ex 427 Closed 109.0 425, 435 L-71/L-72, 425 COPO 3964291 1969-70 396/402 375 L-78, Intake Port 325cc 427 425, 435 L-71/L-72 454 Closed 450 LS-6, 108.0cc 3964292 1970 454 Closed 450 LS-6, 109.0cc 3994025 1971 454 Open 425 LS-6, 118.0cc 3994026 1971 454 Closed 425 LS-6, 118.0cc
6258723 1971 454 Open 425 6272990 1971-94 454 Open 425, 118.0cc, IP 325cc 14096188 1987-94 454 Open 425, 118.0cc, IP 325cc, replacement 14097088 1989-94 502 Open GEN V, 118.0cc, IP 325cc, replacement OVAL PORT - Valve size 2.06 intake, 1.72 exhaust Casting Years CID Chamber CC HP/RPO/Comments 330864 1970-81 366/427/454 Open 330865 1970-84 366/427/454 Open 336765 1973-84 427/454 Open 336781 1973-85 454 Open 113.0cc 343771 1968-85 366/427/454 Open 343772 1976-84 366/427/454 Open 343783 1975-78 454 Open car & truck 346236 1975-87 454 Open 113.0cc 346238 1975-87 454 Open 113.0cc 353049 1970-73 402/454 Open 113.0cc 473328 1968-85 366 Open 3856206 1965-66 396 Closed 325 97.2cc 3856213 1966-70 366 Closed truck 3872702 1966 396 325, 360 L-34/L-35 427 Closed 390, L-36 98.4cc 3876875 1966-70 427 Closed truck 3904390 1966-67 396 325, 350 L-34/L-35 427 Closed 390, 400, L-36/L-68 98.4cc
3904393 1966-68 366 Closed truck 3909802 1966-67 396 325, 350 L-34/L-35 427 Closed 385, 390, 400, L-36/L-68 100.9cc 3917215 1967-69 396 325, 350 L-34/L-35 427 Closed 335, 385, 390, 400 100.9cc 3917219 1966-70 366/427 Closed truck 3931063 1969-70 396 325, 350 L-34/L-35 427 Closed 335, 385, 390, 400 100.9cc 3933148 1969 366/396 Open 2V/427 265 122.1cc car & truck 3933149 1969-70 427 Open 122.1 cc truck 3964280 1966-70 427 335, 385, 390, 400 454 Closed 345, 360, 390 LS-5 3964290 1969-70 396/402 325, 330, 350 427 335, 385,390, 400 454 Closed 345, 360, 390 LS-5 100.9cc 3965198 1969 396 truck 3975950 1968-70 366/427 Closed truck 3986133 1970-85 366/427 Closed truck 3986136 1970-84 366/427 Closed truck 3993820 1971 402 300, 330 LS-3 454 Open 365 LS-5 113.0cc 3999241 1972 402 240, 300, 330 LS-3 454 Open 365 LS-5 113.0cc 6272292 1971 402 240, LS-3 454 Open 270, LS-5
10101136 1991-94 454 Open truck 10121033 1978-88 454 Open truck 12352783 1979-93 454 Open truck 14025175 1983-93 454 Open truck 14081044 1986-90 454 Open truck 14092359 1986-89 427 Open truck 14092360 1985-89 454 Open truck 14101398 1986-90 454 Open truck BBC Camshaft Part Numbers Part # Year Type Lift Dur @.050 lift 340282 Solid.560I/.560E.262I/.262E 353040 3863143 3883986 3904362 3925533 3925535 3959180 1973-74 1965-71 1965-72 1965-71 1965-69 1965-69 1969-70 Comments/Specs/RPO's/Apps 121 deg overlap, competition-short track apps Hyd.440I/.440E.210I/.210E production Corvette Solid.520I/.520E.242I/.242E See Note 1 Hyd.460I/.488E.213I/.217E See Note 2 Solid.520I/.520E.242I/.242E See Note 3 Solid.540I/.560E.262I/.269E Solid.540I/.560E.262I/.269E 133 deg overlap, 427 L-88, Reverse rotation 133 deg overlap, 427 L-88, standard rotation Solid.560I/.600E.262I/.273E 135 deg overlap, 427 ZL-1, 454 LS-7 3994094 Solid.600I/.600E.286I/.286E See Note 4 6272989 Hyd.500I/.500E.222I/.221E 121 deg overlap, marine grind or HP street
14096209 Hyd.500I/.500E.222I/.221E 121 deg overlap, marine grind or HP street (6272989) Note 1: 80 deg overlap, 396 375hp L-78/L-89, 427 425/435hp L-71/L-72, 454 450hp LS-6, HP street Note 2: 396 325/350hp L-34/L-35, 427 385/390/400hp L-36/L-68, 454 345/360/390hp LS-4/LS-5, good torque/hp Note 3: 80 deg overlap, 396 375hp L-78/ L-89, 427 425/435hp L-71/L-72, 454 450hp LS-6, HP street Note 4: 148 deg overlap, maximum power with F.I. or tunnel ram, Can Am BBC Crankshaft Part Numbers Casting # Year CID Comments/Specs/RPO's/Apps 330570 427 truck,1053,forging number 6223 336782 1970-74 454 with automatic transmission 3879621 1967 427 L-88, See Note 1 3882841 1965-71 396 See Note 2 3882842 1965-69 427 forged, cross drilled, balanced for 11:1 CR 3882849 1966-69 427 3887114 1965 396 tufftrided, 5140 3963521 454 4 in stroke, 5140, raw forged 3963523 1970-71 454 LS-6, See Note 3 3963524 1970-71 454 LS-7, See Note 4 3965746 1965-69 430 raw forged, semi finished, 3.4-3.8 stroke 3965753 1970-72 495 raw forged, semi finished, 3.9-4.25 stroke, 5140 3967811 1968-69 427 L-88/ZL-1, See Note 5 3975945 1970 454 with manual transmission 3993804 427 raw forged, 3.75 stroke, 5140 3993878 1971-72 454 LS-6
10051169 454 raw forged, 4340, 3.75-4.25 Note 1: L-88, with 3/8 in bolt rods, balanced for 12.5:1 CR, tufftrided, cross drilled Note 2: forged, cross drilled, 3.76 stroke, tufftrided, balanced for 11:1 CR Note 3: 1053, tufftrided, cross drilled, balanced for 9.25:1 or 11.25:1 CR, forging number - 3520 and 7416 Note 4: 4 in stroke, HD, 5140, LS-7, balanced for 12.5:1 CR, tufftrided, cross drilled Note 5: tufftrided, 5140, with 7/16 in bolt rods, tufftrided, cross drilled, forging number - 7115 BBC Exhaust Manifold Casting Numbers Cast # Years Side CID Applications 329225 1973-76 LH 454 353028 1973-76 LH 454 353030 1973-76 LH 454 police 3856297 1965 LH 396 325 3856301 1965 LH 396 425 Corvette 3856302 1965 RH 396 425 Corvette 3856306 1965 RH 396 325 3857297 1965 LH 396 325 3868874 1965-66 RH 396 325, 360, 375 Z-16 3869925 1965 LH 396 375 Z-16 3872770 1966 RH 396 3880827 1966-69 LH 427/454 Corvette 3880828 1966-72 RH 427/454 Corvette 3880869 1970-72 LH 454 Corvette 3883999 1966 LH 396 325, 360, 375 3884504 1966-67 RH 396/427 325, 385, 390 3892307 1966-67 LH 396/427 325, 390
3902401 1967 LH 396 3904399 1966 LH 396 3909879 1967-70 LH 396/427 COPO/454 325, 350, 375, 425, 430 3909880 1967 RH 396 325, 350, 375 3914613 1968-70 LH 396/427 265, 325, 335, 345, 390, 425 3916178 1968-70 RH 396/427 COPO/454 325, 350, 375, 425, 430 3969869 1970-74 LH 454 Corvette 3989310 1971-72 RH 402/454 3989343 1971-72 LH 402/454 3994045 1973-75 LH 454 police BBC Intake Manifold Casting Numbers ALUMINUM RECTANGULAR PORT - Holley 4V Casting Years CID HP/RPO/Config 3866963 1965 396 375, 425 L-37 3885069 1966-68 396 375 L-78 427 425 L-72 3886093 1967 427 430 L-88 3894374 1967 427 435 3x2 L-71 3894382 1967 427 400 3x2 L-68, oval port 3919849 1968 427 390 L-36, oval port, Qjet 3919850 1968 427 400 3x2 L-68, ovat port 3919852 1968 427 435 3x2 L-71 3919878 1968 396 375 L-78 427 425 L-72 3933163 1968-69 396 375 L-78/L-89 427 425 copo 3933198 1968-69 427 430 L-88/ZL-1 3937793 1968 427 390 L-36, oval port, Qjet, Late 3937795 1969 427 400 3x2 L-68, oval port 3937797 1969 427 435 3x2 L-71
3947801 1969 427 390 L-36, oval port, Qjet 3963569 1970-71 396/402 375 L-78/L-89 454 LS-6, lowrise 3967474 1971 454 425 6269318 1972 454 BBC Intake Manifold Casting Numbers IRON OVAL PORT - Rochester Q-jet 4V Casting Years CID HP/RPO/Config 336789 1974 454 235, 270 346242 1975 454 215 353015 1973 454 215, 245 393841 1973-75 454 215 3856289 1965-66 396 325 L-35 3866948 1966-67 396 325, 360 L-34/L-35 427 390, Holley 3883948 1966-68 396 325 L-35 427 385, 390 L-36 3931067 1969 396 325 L-35 427 335, 390 L-36 3952900 1969 396 265 2V 3955287 1970-71 402 300, 330, 350 LS-3 454 360, 365, 390 6263753 1972 402 240 LS-3 454 240, 270